| 摘要 |
<p>A compsn. (I) comprises macrocyclic polyimide oligomers of formula (1). A1 = mono- or polycyclic aromatic radical; R1 = non-silicon-contg. organic radical or bis(alkylene)polydiorganosiloxane radical; and n = at least 1, provided that neither A1 nor R1 contains a spiro(bis)indane moiety. Also claimed is a method for preparing (I), comprising reacting equimolar amts. of (A) a diamine(s) of formula (2) with (B) an aromatic tetracarboxylic acid(s) of formula (3), both maintained in high dilution in a non-polar organic liq., wherein a phenolic cpd(s). is also present as an acid coreactant (C), opt. if (B) is dianhydride and mandatorily if it is a tetracarboxylic acid: H2N-R3-NH2 (2) A2(COOH)4 (3) A2 = tetravalent mono- or polycyclic aromatic radical; and R3 = as R1.</p> |
